Answers
Atoms make up molecules.
A atom makes up to be a molecule
Related Questions
0.40 L of HNO3 is titrated to equivalence using 0.20 L of 0.2 MNaOH . What is the concentration of the HNO3
Answers
How many grams of lead will be produced if 2.54g of PbS is burned with 1.88g of O2? write the equation
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If 2.54 g of PbS is burned with 1.88 g of O2, approximately 2.20 grams of Pb will be produced.
The balanced equation for the reaction of lead sulfide (PbS) with oxygen (O2) to produce lead (Pb) and sulfur dioxide (SO2) is as follows:
2PbS + 3O2 -> 2Pb + 2SO2
From the balanced equation, we can see that the stoichiometric ratio between PbS and Pb is 2:2 or 1:1. This means that for every 1 mole of PbS, 1 mole of Pb is produced.
To calculate the number of moles of PbS, we need to divide the given mass (2.54 g) by its molar mass:
Molar mass of PbS = 207.2 g/mol (Pb) + 32.07 g/mol (S) = 239.27 g/mol
Moles of PbS = 2.54 g / 239.27 g/mol = 0.0106 mol
Since the stoichiometric ratio between PbS and Pb is 1:1, the number of moles of Pb produced is also 0.0106 mol.
To calculate the mass of Pb, we multiply the number of moles by its molar mass:
Molar mass of Pb = 207.2 g/mol
Mass of Pb = 0.0106 mol x 207.2 g/mol = 2.20 g
This calculation is based on the stoichiometric ratio between PbS and Pb, where 1 mole of PbS produces 1 mole of Pb. By converting the given mass of PbS to moles and then multiplying by the molar mass of Pb, we can determine the mass of Pb produced.
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Who created the periodic table?
Answers
Answer:
Dmitri Mendeleev=Russian chemist, Albert Ghiorso=American scientist
Explanation:
solid zinc(ii) sulfide reacts with aqueous hydrobromic acid (hbr) to form aqueous zinc(ii) bromide and dihydrogen sulfide gas. express your answer as a chemical equation. identify all of the phases in your answer.
Answers
The balanced chemical equation for the reaction between solid zinc(II) sulfide and aqueous hydrobromic acid (HBr) to form aqueous zinc(II) bromide and dihydrogen sulfide gas is:
ZnS(s) + 2 HBr(aq) → ZnBr2(aq) + H2S(g)
In this equation, the phases of each substance are indicated in parentheses after the chemical formula.
The solid zinc(II) sulfide (ZnS) is indicated by the "(s)" phase, the aqueous hydrobromic acid (HBr) is indicated by the "(aq)" phase, the aqueous zinc(II) bromide (ZnBr2) is indicated by the "(aq)" phase, and the dihydrogen sulfide gas (H2S) is indicated by the "(g)" phase.
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If you put a plant across the room from a window, how will this affect the growth of the plant?
The plant will grow away from the light source.
The plant will grow toward the light source.
The plant will grow faster.
The plant will stop growing,
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How many grams of BaPO3 are present in a 3.8 mole sample?
Answers
Explanation:
M(Bapo3) = 216m/mol
n = 3.8 mole
m = M × n = 216 × 3.8 = 820.8g
The density of copper is 8.94 g/cm 3 at 20°C and 8.91 g/cm 3 at 60°C. This density decrease is the result of which of the following? State by inserting T for True or F for false with a possible explanation for each of the following statements. (a) The metal expands. (b) The metal contracts. (c) The mass of the metal increases. (d) The mass of the metal decreases.
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The true statement is that the metal expands, causing increase in volume which consequently causes the density to decrease slightly.
The density of a substance depends on its mass and its volume. Copper is a metallic substance. We usually define the density of a substance as the ratio of mass to volume.
This means that, as the volume of a substance increases or decreases, the density of the substance is affected.
Having said that, we need to be reminded that the mass of the substance does not change when the metal is heated but the metal may increase in volume (expand) when heated or decrease in volume(contract) when cooled.
When a metal expands, its density decreases. As we can see, the density of copper decreased from 8.94 g/cm 3 at 20°C to 8.91 g/cm 3 at 60°C.
So, the following are true or false;
The metal expands - True
The metal contracts - False
The mass of the metal increases - False
The mass of the metal decreases - False
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The reaction 2 NO(g) ⇌ N2(g) + O2(g) has a Kc value of 2400 at 2000 K. If 0.850 M each of N2 and O2 are initially present in a 3.00-L vessel, calculate the equilibrium concentrations of NO, N2, and O2.
(I hope the word problem can be solved because my modules will be passed soon).
Answers
Answer:
[N2] = [O2] = 0.841M
And [NO] = 0.00172M
Explanation:
The equilibrium constant of this reaction, Kc, is:
Kc = 2400 = [N2] [O2] / [NO]²
Where [] are the equilibrium concentration of each specie.
The initial concentration of [N2] = [O2] = 0.850M. The equilibrium will shift to the left in order to produce NO. The equilibrium concentrations are:
[N2] = [O2] = 0.850M - X
And [NO] = 2X
Replacing:
2400 = [0.850-X]² / [2X]²
9600X² = 0.7225 - 1.7 X + X²
0 = 0.7225 - 1.7 X - 9599X²
Solving for X:
X = -0.0088M. False solution, there is no negative concentrations.
X = 0.00859M. Right solution.
Replacing:
[N2] = [O2] = 0.850M - 0.00859M
And [NO] = 2*0.00859M
[N2] = [O2] = 0.841M
And [NO] = 0.00172M
Which one of the following will reduce vehicular NOx emissions?
A) washing the car
B) rolling down the windows instead of using the AC
C) keeping the car well tuned
D) pumping gas at night
Answers
Keeping the car well tuned with regular servicing helps to reduce the emission of oxides of nitrogen gas to the atmosphere. Hence, option B is correct.
What is NOₓ ?NOₓ is a representation of oxides of nitrogen gas. Nitrogen gas reacts with atmospheric oxygen produces NO, NO₂ etc. all are causing atmospheric pollution and other serious issues such as acid rain, global warming, ozone layer depletion etc.
Thus, it is very important to reduce the emission of oxides of nitrogen. Vehicles and industries are the main sources of NOₓ emission. Evolving these gas directly to air caused serious consequences.
Keeping the vehicles maintained regularly with ensuring that no gas leakage or over expulsion is there. Hence, option C is helpful to reduce the emission of this gas.
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According to the article, elements are named by the number of protons in the nuclei.
Which paragraph BEST supports the idea outlined above?
A
The periodic table is getting a little bit longer, thanks to the addition of four super-heavy elements.
B
The discoveries of elements 113, 115, 117 and 118 were confirmed recently by the International Union of Pure and Applied Chemistry. The group vets the man-made elements seeking a permanent spot on the periodic table, a chart listing all the elements that hangs in science classrooms around the world.
C
Atoms are the building blocks that make up elements. At the center of each atom is a nucleus composed of small particles called protons and neutrons. Nuclei is the plural of nucleus.
D
The new elements are known as super-heavy elements. Element 118, for example, is the heaviest element to date, with 118 protons alongside 176 neutrons.
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The correct answer is: Atoms are the building blocks that make up elements. At the center of each atom is a nucleus composed of small particles called protons and neutrons. Nuclei is the plural of nucleus; option C.
What is atomic number of an element?The atomic number of an element is the number of protons present in the nucleus of the atom of the element.
The nucleus is the center of the atom and is the heaviest part of the atom.
Another sub-atomic particle fund in the nucleus is the neutron.
Elements are named according to the number of protons in the nuclei.. This is because the number of protons in the nucleus of any given atom whereas the neutron number may vary, Also, electrons are easily removed from atoms of elements.
In conclusion, the number of protos in atom is used to name the atom.
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How do I go about solving a Nuclear Equation?
Answers
Answer:
How do amoeba respire.
How do plants respire.
An OBJECT absorbs like between the light wavelengths of 430 - 400 nm. What is the color of the OBJECT?
Answers
The color of the object appears as yellow/orange.
What is the color?
The visible light spectrum spans a wavelength range of 400 to 700 nanometers (nm), with shorter wavelengths appearing as blue or violet and longer wavelengths as red.
This object is absorbing light with wavelengths between 430 and 400 nm, indicating that it is absorbing light that is visible in the blue and violet spectrum.
We know that this color that we see is actually a complementary color to blue/violet from the color wheel.
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If 50 joules of energy is added to sample of water, the temperature will?
Answers
Explanation:
The temperature change of a substance when it absorbs or loses energy can be calculated using the specific heat capacity of the substance. The specific heat capacity of water is approximately 4.18 J/(g°C), which means that it takes 4.18 joules of energy to raise the temperature of 1 gram of water by 1 degree Celsius.
To calculate the temperature change of the water sample when 50 joules of energy is added, we need to use the following equation:
q = m * c * ΔT
where q is the amount of energy absorbed by the water, m is the mass of the water sample, c is the specific heat capacity of water, and ΔT is the resulting temperature change.
Rearranging the equation to solve for ΔT, we get:
ΔT = q / (m * c)
Plugging in the values, we get:
ΔT = 50 J / (m * 4.18 J/(g°C))
We need to know the mass of the water sample to calculate the temperature change. Let's assume a mass of 10 grams:
ΔT = 50 J / (10 g * 4.18 J/(g°C))
ΔT = 1.2°C
Therefore, if 50 joules of energy is added to a 10-gram sample of water, the resulting temperature change will be approximately 1.2 degrees Celsius.
The enthalpy of vaporization for methanol is 35.2 kJ/mol. Methanol has a vapor pressure of 1 atm at 64.7 oC. Using the Clausius-Clapeyron equation, what is the vapor pressure for methanol at 55.5 oC? Give your answer in atmospheres, to the third decimal point.
Answers
Answer: 55.5 oC is 0.014 atm (3rd decimal point)
Explanation:
The Clausius-Clapeyron equation is given as:
ln(P2/P1) = -(ΔH_vap/R) * (1/T2 - 1/T1)
where:
P1 = vapor pressure at temperature T1
P2 = vapor pressure at temperature T2
ΔH_vap = enthalpy of vaporization
R = gas constant = 8.314 J/(mol*K)
Converting the enthalpy of vaporization to J/mol:
ΔH_vap = 35.2 kJ/mol = 35,200 J/mol
Converting temperatures to Kelvin:
T1 = 64.7 + 273.15 = 337.85 K
T2 = 55.5 + 273.15 = 328.65 K
Substituting the values into the equation and solving for P2:
ln(P2/1 atm) = -(35,200 J/mol / 8.314 J/(mol*K)) * (1/328.65 K - 1/337.85 K)
ln(P2/1 atm) = -4.231
P2/1 atm = e^(-4.231)
P2 = 0.014 atm
Therefore, the vapor pressure for methanol at 55.5 oC is 0.014 atm, to the third decimal point.
At what temperature will water begin to boil
Answers
Answer:
water will boil at 100 celcius or 212 farenheit
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Answer:
At 100° C or 373.15K
Explanation:
Jonathon is conducting an experiment to determine how much precipitate (solid product) will form when combining measured volumes of Aich, and NaOH. According to his calculations the reaction should produce 26.0 grams of solid AKOH), when combined. However, when Jonathon measures the mass of the solid precipitate formed in his experiment, he finds that the experiment actually produced 24.5 grams of Al(OH).
Answers
Jonathon's experiment produced 24.5 grams of Al(OH), which is less than the predicted amount of 26.0 grams of AKOH. The discrepancy could be due to measurement errors, incomplete reaction.
What is discrepancy?
To determine the cause of the discrepancy, Jonathon should first review his experimental procedure and make sure that all measurements and calculations were performed accurately. He should also check that the reactants were mixed thoroughly and that the reaction was allowed to proceed to completion. If any errors or inconsistencies are identified, Jonathon should correct them and repeat the experiment to obtain more accurate results.
If the experimental procedure was carried out correctly and the discrepancy cannot be attributed to measurement errors, Jonathon should consider the possibility of impurities in the reactants. Even small amounts of impurities can affect the outcome of a chemical reaction, so it is important to use high-quality, pure chemicals in experiments whenever possible.
Overall, the most important thing for Jonathon to do in this situation is to carefully review his experimental data and methodology, and to identify any potential sources of error or uncertainty. By doing so, he can improve the accuracy and reliability of his results and draw more meaningful conclusions from his experiment.
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In a gas chromatogram, the retention time of compounds A and B are 1.25 min and 1.45 min, respectively. If both of these compounds have similar structures, which of the compounds has a higher boiling point?
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In a gas chromatogram, the retention time of compounds A and B are 1.25 min and 1.45 min, respectively. If both of these compounds have similar structures, Compound A has a higher boiling point.
Gas chromatogram is a widely used technique in analytical chemistry for the separation and investigation of compounds that may evaporate without disintegrating (GC). The purity of a substance can be assessed by GC, as can the components of a mixture. Preparative chromatography can make use of GC to separate pure compounds from a mixture. Other names for gas chromatography include vapor-phase chromatography (VPC) and gas-liquid partition chromatography (GLPC). These alternative names and the accompanying acronyms are frequently used in scientific literature. Gas chromatography is a technique for separating compounds in mixtures by injecting a gaseous or liquid sample into a mobile phase, which is usually referred to as the carrier gas, and passing the gas through a stationary phase. The mobile phase is often composed of an inert gas or an unreactive gas, such as helium, argon, nitrogen, or hydrogen. The stationary phase is a minuscule layer of viscous liquid on a surface of solid particles on an inert solid support in a piece of glass or metal tubing known as a column.
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The element magnesium, Mg, has three common isotopes:24Mg, 25Mg, and 26Mg. The difference between these three isotopes is Question 7 options: the number of neutrons. the number of electrons. the number of protons. the number of protons and electrons. their physical state.
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The difference between all three Magnesium, Mg isotopes is in; the number of neutrons.
What is isotopy?Isotopy is a property of elements in which case the element has two or more types of atoms that have the same atomic number and hence, same position in the periodic table, but differ in nucleon numbers due to different numbers of neutrons in their nuclei.
Ultimately, the distinctive feature between the three isotopes is in their number of neutronsRead more on isotopes;
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If we had 8.02 x 10²⁴ atoms of neon, how many moles would this be?
Answers
Number of moles = 13.3 moles
The appropriate ratio will be 1/6.02*10²³
Explanations:According to the Avogadro's constant;
\(\text{1mole}=6.02\times10^{23}atoms\)Given the following parameters
Atoms of neon = 8.02 x 10²⁴ atoms
Find the moles of neon
\(\begin{gathered} moles\text{ of neon}=\frac{8.02\times10^{24}}{6.02\times10^{23}} \\ moles\text{ of neon=1.33}\times\frac{10^{24}}{10^{23}} \\ moles\text{ of neon}=1.33\times10^1 \\ moles\text{ of neon}=13.3moles \end{gathered}\)Hence the number of moles this would be is approximately 13.3 moles
The appropriate ratio will be expressed as:
\(8.02\times10^{24}\times\frac{1}{6.02\times10^{23}}\)In all covalent bonds, valence electrons are ___
lost
gained
shared
Answers
shared
Explanation:Covalent bonds are characterized by the sharing of valence electrons.
Electronegativity
Covalent bonds occur between atoms that have similar electronegativity. Remember that electronegativity is how strongly an atom pulls electrons toward itself. So, if 2 atoms have similar electronegativities, then they will pull somewhat equally upon the electrons and share them. Most commonly, covalent bonds occur between nonmetals.
Ionic Bond
The second major form of bonding is ionic bonding. Ionic bonds form when there is a large difference in electronegativities. The difference is great enough that one of the atoms will completely lose one or more electrons, while the other will take the electrons. Since electrons are being transferred, the atoms become ions. Ionic bonds commonly occur between metals and nonmetals.
Calculate the molar mass of ZnCr04
Answers
Answer:
181.403 g/mol is the answer as it is Zinc chromate
Explanation:
Answer:
181.403 g/mol
Explanation:
Molar mass of ZnCrO4 = 181.3737 g/mol. This compound is also known as Zinc Chromate. Convert grams ZnCrO4 to moles or moles ZnCrO4 to grams. 65.38 + 51.9961 + 15.9994*4
How many moles are in 59.6 grams of BaSO4
Answers
Answer:
0.2553669915026199 BaSO4
Explanation:
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6. How many moles are in 8.30 x 1023 molecules of CO₂?
a.
b.
C.
d.
1.37
2.8
55.5
100
Answers
Trend of atomic number and atomic size of the elements when we move from left to right in different periods of periodic table
Answers
Answer:
The atomic size decreases with an increase in atomic number when we move from left to right.
Explanation: Hope it helps you:))))))
Have a great day.
How did the nucleus evolve through time?
Answers
Answer:
The nucleus represents a major evolutionary transition. As a consequence of separating translation from transcription many new functions arose, which likely contributed to the remarkable success of eukaryotic cells. Here we will consider what has recently emerged on the evolutionary histories of several key aspects of nuclear biology; the nuclear pore complex, the lamina, centrosomes and evidence for prokaryotic origins of relevant players.
How many atoms of P are in 802 g of Na3PO4?
Express your answer to 3 significant figures.
Answers
Number of atoms of P in 802 gm of Na3PO4 is calculated to be equal to 23.254 *10^21 .
What is known as molar mass ?The mass in grams of 1 mole of the substance is known as molar mass. We can obtain molar mass of a substance by summing the molar masses of its component atoms. Then we can use the calculated molar mass to convert between mass and number of moles of substance.
Molar mass of P is 30.97
Number of atoms of P = 30.97/802 * 6.22 *10^23
Number of atoms of P in 802 gm of Na3PO4 = 23.254 *10^21.
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A chipmunk has a mass of 0.7 kg. What is its weight? (Acceleration due to gravity on Earth is 9.8 m/s2).
Answers
Answer:
W=ma
=0.7×9.8
=6.86N
....................
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When ignited, a uranium compound burns with a green flame. The wavelength of the light given off by this flame is greater than that of _____.
Answers
Answer:
Ultraviolet light.
Explanation:
Uranium is a natural radioactive chemical element with the chemical symbol "U" and an atomic number of 92. Uranium is used for generating nuclear fuels which are typically used in powering atomic bombs and nuclear reactors in the field of electricity generation.
When ignited, a uranium compound burns with a green flame. The wavelength of the light given off by this flame is greater than that of ultraviolet light which typically ranges from 100nm to 400nm. Where, nm is represents nanometer.
Basically, when ignited, a uranium compound burns with a green flame having a wavelength of 4.30 x 10^-7m to 5 x 10^-7m.
Determine the molarity of a solution formed by dissolving 0.589 g of Mgl2 in enough water to yield 75.0 mL of solution.A. 0.0946 Mb. 0.0337 Mc. 0.0282 Md. 0.0107 Me. 0.0589 m
Answers
Explanation:
Molarity is the ratio between the amount of substance in the solute, measured in mol (n1), and the volume of the solution in liters (V). This concentration is measured in mol per liter (mol/L).
The mathematical formula used to calculate this concentration is given by:
M = n1/V
First, we need to transform 0.589 g of MgI2 into moles. For this, we use the molar mass of MgI2.
Molar mass of Mg = 24.305 g/mol
molar mass of I = 126.90 g/mol
MgI2 = (1*24.305) + (2*126.90) = 278.1 g/mol
Now we use the following formula to transform grams to moles: moles = mass/molar mass
mass = 0.589 g
molar mass = 278.1 g/mol
moles = 0.589/278.1
moles = 2.1 x 10^-3
Now let's calculate the molarity:
n1 = 2.1 x 10^-3 moles
V = 75 mL = 0.075 L
M = 2.1 x 10^-3 /0.075
M = 0.0282 M
Answer: Alternative c. 0.0282 M
Determine whether each statement is an example
of a physical change or a chemical change.
Wood is burned.
physical
chemical
0
Dry ice (solid carbon dioxide) vaporizes to form
carbon dioxide gas.
Ophysical
chemical
DONE ✔
Answers
Answer:
Burning of wood is chemical change
Dry ice into Carbon dioxide conversion is physical change.
Explanation:
Because when wood is burnt it cannot be recovered back by tthe ashes. So it is chemical change.
Dry ice conversion into Carbon dioxide is a physical change because the chemical composition remains same.
Answer:
wood = chemical
dry ice = physical
Explanation: